How do I use Chromecast Built-In (Google Cast) on my Android TV?

You can set up the Chromecast built-in (Google Cast™) feature as an alternative to the Miracast® or Screen Mirroring feature to cast your favorite entertainment and apps from your mobile device or computer to your Android TV™ device or speakers. Set up Chromecast built-in using the Google Chrome™ browser or Chromecast-enabled apps and websites.